Part number 550-100-305/0916
17
AquaBalance
TM
W
ALL
M
OUNT
GAS
-
FIRED
WATER
BOILER
— C
OMBI
Boiler Manual
6 Venting/air piping — general
Do not install the boiler into a common vent
with any other appliance. This will cause flue
gas spillage or appliance malfunction, resulting
in possible severe personal injury, death or sub-
stantial property damage.
Existing common vent systems may be too large
for the appliances remaining connected after the
existing boiler is removed.
Failure to follow all instructions can result in
flue gas spillage and carbon monoxide emissions,
causing severe personal injury or death.
When removing a boiler from an
existing common vent system
4HEBOILERCANNOTBECOMMONVENTEDWITHANYOTHERAPPLI
-
ance
. When an existing boiler is replaced with a boiler, the boiler
CANNOT use the existing common vent. The boiler requires
its own vent and air piping, as specified in this manual. This
may cause a problem for the appliances that remain on the old
common vent, because the vent may be too large. The following
test is intended to check for proper operation of the appliances
remaining on the old common vent system.
6ENTSYSTEMVERIlCATION
Perform the test sequence below for
each
appliance remaining
on the original common vent system. Operate each appliance
individually, with other appliances turned off. This procedure
will test whether the common vent system can properly vent
each appliance.
Existing vent test procedure
(The following is intended to test whether the appliances
remaining on an existing vent system will operate
satisfactorily.)
1. Seal any unused openings in the common venting system.
2. Visually inspect the venting system for proper size and hori-
zontal pitch and determine there is no blockage or restriction,
leakage, corrosion or other deficiencies which could cause an
unsafe condition.
3. Test vent system — Insofar as is practical, close all build-
ing doors and windows and all doors between the space in
which the appliances remaining connected to the common
venting system are located and other spaces of the building.
Turn on clothes dryers and any appliance not connected to
the common venting system. Turn on any exhaust fans, such
as range hoods and bathroom exhausts, so they will operate
at maximum speed. Do not operate a summer exhaust fan.
Close fireplace dampers.
4. Place in operation the appliance being inspected. Follow the
operating instructions. Adjust thermostat so appliance will
operate continuously.
5. Test for spillage at draft hood relief opening after 5
minutes of main burner operation. Use the flame of a
match or candle, or smoke from a cigarette, cigar, or pipe.
6. After it has been determined that each appliance remain-
ing connected to the common venting system properly
vents when tested as outlined herein, return doors, win-
dows, exhaust fans, fireplace dampers, and any other gas-
burning appliance to their previous conditions of use.
Any improper operation of common venting system should
be corrected so the installation conforms with the National
Fuel Gas Code, ANSI Z223.1 — latest edition. Correct by
re-sizing to approach the minimum size as determined using
the appropriate tables in Part 13 of that code.
